Katy Perry out in London, March 19th 2011 – photo: PacificCoastNews.com

Katy Perry is wearing the Sea Swans Kaftan Dress by Emma Cook. Katy’s exact style is not available in any online shops, but can be ordered from the designer’s official website for £275. A sleeveless drape neck version of the dress is available for £179 at Matches or £349/$625.76 at ASOS.

In this new photo by The Hundreds, Hayley Williams is wearing the Pointelle Scallop Over-the-Knee Socks from Urban Outfitters in black ($14.00).

Ellie Goulding live at The Music Box Theatre in Hollywood, CA by Carl Pocket

Ellie Goulding has been wearing her blue Alice by Temperley Game Jacket for most of her current US tour, but at her April 20th concert she instead opted to wear the black version, which is $375 at Net-A-Porter.

Her top is the Truly Madly Deeply Animal Cross Tee. Ellie is wearing the more slim-fitted version which is sold at Urban Outfitters UK for £28.00, and she has cut off the sleeves and collar to make it into a tank – which you can see in this photo. Urban Outfitters US sells the same print on a loose fitting dolman tee for $38.00.

You can buy a basic pair of running shorts similar to hers at American Apparel. Her tights are House of Holland’s Chain Suspender Tights, which mimic the look of thigh-highs held up by golden garters. They sell for $28.00 at Urban Outfitters or £12.00 at Next.

More House of Holland…

Juliet Simms on the set of the "Heart Song" music video for her band Automatic Loveletter

You can get white heart-shaped sunglasses like Juliet’s for $6.95 on Amazon. Urban Outfitters also sells a pair for $14.00.

Ellie Goulding live at Coachella on April 17, 2011 by Maurice Li

At Day 3 of the 2011 Coachella Music and Arts Festival, Ellie Goulding performed in Topshop’s Pink Floral Button Back Crop Top ($32/£16) and high-waisted black shorts with her favorite Alice by Temperley star belt ($123.75).

Katy Perry on the set of her "E.T." music video

Katy Perry wore these Vogue sunglasses in her E.T. music video, which features Kanye West. The glass are available in 4 colours. Katy wears Ginseng Gradient Gray.

Vogue VO2677S Sunglasses in colour 186711 – Ginseng Gradient Gray Gradient – £59.40

watch the video

Ellie Goulding at the Nylon magazine SXSW party on March 17, 2011 by Waytao Shing

Ellie Goulding is wearing the Topshop Stripe Slash Arm Tank ($36/£18) with a Chanel necklace.

The Dirty Work Tour at the Tabernacle in Atlanta, GA on April 3, 2011 by Cameron Sorrell

Hey Monday’s Cassadee Pope wore the Silk Tribal Print Top from Forever 21 ($24.80) while singing guest vocals on stage with All Time Low at the Atlanta stop of the Dirty Work Tour.

Hayley Williams was photographed at Jeremy Scott‘s Coachella afterparty wearing the French Fries Swimsuit (€79) from his Adidas collaboration line. The swimsuit uses a french fry print that appeared on multiple looks in his own Fall/Winter 2006 food-themed collection entitled “Eat The Rich.”

photo from thecobrasnake, thanks Carollina and framebyframe

Watch Sierra Kusterbeck show off her impressive collection of boots from Sam Edelman, Jeffrey Campbell, Aldo, and more – including some pairs which I’ve never seen her wear. She says: “I started getting into shoes because on stage it’s hard to wear crazy things because I’m moving around and I need to keep everything in, so I was like, ‘you know what, I can wear crazy shoes.‘”. Sierra shows off the boots that started her obsession and explains how she had to train herself to walk in heeled shoes.

more footage